<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb>
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        :closable="false"
        edid-icon
      >
      </el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tab页签 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handelClose(i,scope.row)"
                  >{{ item }}</el-tag
                >
                <!--输入的文本框  -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
               <!--  添加的按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column
              type="index"
              label="序号"
              width="70px"
            ></el-table-column>
            <el-table-column
              label=" 参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label=" 操作">
              <template v-slot="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                ></el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                ></el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态参数面板 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handelClose(i,scope.row)"
                  >{{ item }}</el-tag
                >
                <!--输入的文本框  -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
               <!--  添加的按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column
              type="index"
              label="序号"
              width="70px"
            ></el-table-column>
            <el-table-column
              label=" 属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label=" 操作">
              <template v-slot="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                ></el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                ></el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClose"
    >
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!--  修改参数对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClose"
    >
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //商品分类列表
      cateList: [],
      //级联选择框数据配置
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
      },
      //级联选择框绑定到的数组
      selectedKeys: [],
      // 被激活的页签名称
      activeName: 'many',

      //动态参数数据
      manyTableData: [],
      //静态属性参数
      onlyTableData: [],
      //添加参数显示与隐藏
      addDialogVisible: false,
      //添加参数的表单对象
      addForm: {
        attr_name: '',
      },
      //添加表单验证规则
      addFormRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            trigger: 'blur',
          },
        ],
      },
      //修改参数显示与隐藏
      editDialogVisible: false,
      //修改表单的数据对象
      editForm: {},
      //修改表单的验证规则
      editFormRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            trigger: 'blur',
          },
        ],
      },
      //控制按钮与文本框的显示与隐藏
      inputVisible:false,
      //文本框中输入的内容
      inputValue:''
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //获取所有商品分类数据列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败')
      }
      this.cateList = res.data
      console.log(this.cateList)
    },
    //级联选择框选中项变化，会触发这个函数
    handleChange() {
      this.getParamsData()
    },
    //Tab页签点击事件的处理函数
    handleTabClick() {
      console.log(this.activeName)
      
      this.getParamsData()
    },
    //获取参数的数据列表
    async getParamsData() {
      // console.log(this.selectedKeys)
      //证明选中的不是3级分类
      if (this.selectedKeys.length !== 3) {
        this.selectedKeys = []
         this.manyTableData = []
        this.onlyTableData=[]
        return
      }
      //证明选中三级
      console.log(this.selectedKeys)
      //根据所选分类ID，和当前所处面板many或only，获取对应参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: {
            sel: this.activeName,
          },
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      //展开行数据+空格
      res.data.forEach((item) => {
        //三元表达式进行判断  item.arrt_vals是否为空： item.arrt_vals ？
        //如果为空 则添加空格分割 item.attr_vals.split(' ')
        //否则返回空白数组 [ ]
        //完整版 item.attr_vals ?  item.attr_vals.split(' '):[]
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        //控制文本框的显示与隐藏
        item.inputVisible =false
        //文本框中输入的值
        item.inputValue = ''
      })

      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },

    //监听重置添加对话框关闭事件
    addDialogClose() {
      this.$refs.addFormRef.resetFields()
    },
    //点击确定按钮完成添加参数或属性
    addParams() {
      //当用户点击确定按钮时校验表单
      this.$refs.addFormRef.validate(async (valid) => {
        //校验不通过 则return
        if (!valid) return
        //校验通过 刚发起网络请求完成添加参数或属性
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
          }
        )

        if (res.meta.status !== 201) {
          return this.$message.error('添加' + this.titleText + '数据失败')
        }
        this.$message.success('添加' + this.titleText + '数据成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    //点击按钮，显示修改参数对话框
    async showEditDialog(attr_id) {
      //查寻当前参数的信息
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        {
          params: { attr_sel: this.activeName },
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    //重置修改表单
    editDialogClose() {
      this.$refs.editFormRef.resetFields()
    },
    //点击确定按钮，完成修改
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return

        //发送请求完成修改
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName,
          }
        )
        if (res.meta.status !== 200) {
          this.$message.error('修改参数失败')
        } else {
          this.$message.success('修改参数成功')
          this.getParamsData()
          this.editDialogVisible = false
        }
      })
    },
    //删除
    async removeParams(attr_id) {
      //根据对应ID删除数据属性
      //弹窗询问用户是否删除
      const confirmResult = await this.$confirm(
        '请问是否要删除该' + this.titleText,
        '删除提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning',
        }
      ).catch((err) => err)

      //如果用户点击确认，则confirmResult 为'confirm'
      //如果用户点击取消, 则confirmResult获取的就是catch的错误消息'cancel'
      if (confirmResult != 'confirm') {
        return this.$message.info('已经取消删除')
      }

      //没有取消就是要删除，发送请求完成删除
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      )

      if (res.meta.status !== 200) {
        return this.$message.error('删除参数数据失败')
      }
      this.$message.success('删除' + this.titleText + '数据成功')
      this.handleChange()
    },
    //文本框失去焦点或按下了enter 都会触发
   async handleInputConfirm(row){
     // console.log('ok')
     if(row.inputValue.trim().length ===0){
       row.inputValue = ''
       row.inputVisible =false
       return
     }
     //如果没有return ,则证明输入的内容，要做后续处理
     row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
   //需要发请请求，保存这次操作
      this.saveAttrVals(row)
    

    },
    //将对attr_vals 的操作 保存到数据库
    async saveAttrVals(row){
      //需要发请请求，保存这次操作
      const{data:res} = await  this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
        attr_name:row.attr_name,
        attr_sel:row.attr_sel,
        attr_vals:row.attr_vals.join(' ')
      })
      if(res.meta.status!= 200){
          return this.$message.error('修改参数项失败')
      }
      this.$message.success('修改参数成功！')
    },
    //点击按钮，展示文本输入框
    showInput(row){
      row.inputVisible = true
      //$nextTick 方法作用：就是页面上元素被重新渲染后，才会指定回调函数代码
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });

    },
  //    删除对应的参数可选项
    handelClose(i,row){
      row.attr_vals.splice(i,1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    //如果按钮需要禁用，则返回true,否则返回为true
    isBtnDisabled() {
      if (this.selectedKeys.length !== 3) {
        return true
      }
      return false
    },
    //当前选中的三级分类的Id
    cateId() {
      if (this.selectedKeys.length === 3) {
        return this.selectedKeys[2]
      } else {
        return null
      }
    },
    //动态计算标题文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    },
  },
}
</script>

<style lang="scss" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag{
  width: 120px;
}

</style>